Air filter arrangement; air cleaner assembly; and methods

ABSTRACT

A media pack for including in a filter cartridge of an air filter arrangement, is provided. The media is a non-rectangular perimeter configuration, an example shown being trapezoidal. Filter cartridges including such media packs, air cleaner assemblies and equipment systems are described. Also methods of use assembly are described.

This application is being filed on 22 Feb. 2008, as PCT InternationalPatent application in the name of Donaldson Company, a U.S. nationalcorporation, applicant for the designation of all countries except theUS, and Benny Kevin Nelson and David W. Nelson, both citizens of theU.S., applicants for the designation of the US only, and claims priorityto U.S. Provisional Patent Application No. 6/903,387, filed Feb. 26,2007.

FIELD OF THE DISCLOSURE

The present disclosure relates to filter arrangements for use infiltering gases. The disclosure particularly relates to media packs thatuse z-filter media as characterized herein. Z-filter media generallycomprises fluted media secured to facing media, formed into a mediapack. More specifically, the disclosure relates to such media packs andtheir inclusion in serviceable air filter cartridges for use in aircleaners. Air cleaner arrangements and methods of assembly and use arealso described.

BACKGROUND

Air streams can carry contaminant material therein. In many instances,it is desired to filter some or all of the contaminant material from theair stream. For example, air flow streams to engines (for examplecombustion air) for motorized vehicles or for power generationequipment, gas streams to gas turbine systems and air streams to variouscombustion furnaces, carry particulate contaminant therein that shouldbe filtered. It is preferred for such systems, that selected contaminantmaterial be removed from (or have its level reduced in) the air. Avariety of air filter arrangements have been developed for contaminantrejection. Improvements are sought.

SUMMARY

According to present disclosure, features, techniques and components areprovided for use in air cleaner assemblies and components therefor.Described are media packs comprising media strips including fluted mediasheets secured to facing media sheets, sometimes referred herein asz-filter media constructions. Certain of the described techniques relateto providing media picks of unique shapes, for convenience. An exampleunique shape is provided, in the form of a media pack with a trapezoidalperimeter shape, when viewed toward an inlet flow face or an outlet flowface of the media pack.

Filter cartridges incorporating such media packs, air cleaner assembliesincorporating them, and equipment systems incorporating such aircleaners, are described.

Also, new and advantageous features for air cleaners are described.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a fragmentary, schematic, perspective view of z-filter mediauseable in arrangements according to the present disclosure.

FIG. 2 is an enlarged, schematic, cross-sectional view of a portion ofthe media depicted in FIG. 1.

FIG. 3 includes schematic views of examples of various fluted mediadefinitions.

FIG. 4 is a schematic view of an example process for manufacturing mediaaccording to the present disclosure.

FIG. 5 is a schematic cross-sectional view of an optional end dart formedia flutes useable in arrangements according to the presentdisclosure.

FIG. 6 is a schematic depiction of a step of creating a stacked z-filtermedia pack.

FIG. 7 is a schematic perspective view of a media stack with phantomlines indicating cut lines or a cut plane, for a step for preparing amedia pack for inclusion in filter cartridge according to the presentdisclosure.

FIG. 8 is a schematic perspective view depicting media pack FIG. 7separated, into two media packs, after a step of cutting.

FIG. 9 is a schematic outlet flow face perspective view of filtercartridge incorporating a media pack in accord with the processschematically depicted in FIGS. 7 and 8.

FIG. 10 is a schematic inlet face plan view of the filter cartridgedepicted in FIG. 9.

FIG. 11 is a schematic, cross-section view taken along line 11-11, FIG.10.

FIG. 12 is a schematic, enlarged, fragmentary cross-sectional view of aportion of the filter cartridge depicted in FIG. 11.

FIG. 13 is a schematic, fragmentary, cross-sectional view of the portionof the filter cartridge depicted in FIG. 12, depicted positioned betweentwo housing sections.

FIG. 14 is a schematic, exploded, outlet end perspective view of an aircleaner assembly including a filter cartridge according to FIGS. 9-12,therein.

FIG. 15 is an outlet end perspective view of an air cleaner assemblyFIG. 14, in a non-exploded view.

FIG. 16 is an inlet end perspective view of the air cleaner of FIG. 15.

FIG. 17 is a fragmentary, schematic, view of an equipment system of anequipment system including an air cleaner assembly according to FIG.14-16 installed therein; the view of FIG. 17 being toward an access orservice cover of the air cleaner.

FIG. 18 is a fragmentary schematic view of the equipment assembly ofFIG. 17; the view of FIG. 18 being directed toward an outlet end of theair cleaner.

FIG. 19 is a side elevational view of the equipment system depicted inFIGS. 17 and 18.

FIG. 20 is a schematic, exploded perspective view of the assemblydepicted in FIGS. 17-20; the view of FIG. 20 being generally toward theaccess cover and inlet end.

FIG. 21 is a schematic fragmentary outlet end perspective view of theequipment assembly depicted in FIGS. 17-20.

DETAILED DESCRIPTION I. Z-Filter Media Configurations, Generally

Fluted filter media can be used to provide fluid filter constructions ina variety of manners. One well known manner is characterized herein as az-filter construction. The term “z-filter construction” as used herein,is meant to refer to a filter construction in which individual ones ofcorrugated, folded or otherwise formed filter flutes are used to definesets of longitudinal, typically parallel, inlet and outlet filter flutesfor fluid flow through the media; the fluid flowing along the length ofthe flutes between opposite inlet and outlet flow ends (or flow faces)of the media. Some examples of z-filter media are provided in U.S. Pat.Nos. 5,820,646; 5,772,883; 5,902,364; 5,792,247; 5,895,574; 6,210,469;6,190,432; 6,350,296; 6,179,890; 6,235,195; Des. 399,944; Des. 428,128;Des. 396,098; Des. 398,046; and, Des. 437,401; each of these fifteencited references being incorporated herein by reference.

One type of z-filter media, utilizes two specific media componentsjoined together, to form the media construction. The two components are:(1) a fluted (typically corrugated) media sheet; and, (2) a facing mediasheet. The facing media sheet is typically non-corrugated, however itcan be corrugated, for example perpendicularly to the flute direction asdescribed in U.S. provisional 60/543,804, filed Feb. 11, 2004, andpublished as PCT WO 05/077487 on Aug. 25, 2005, incorporated herein byreference.

The fluted (typically corrugated) media sheet and the facing media sheettogether, are used to define media having parallel inlet and outletflutes. In some instances, the fluted sheet and facing sheet are securedtogether and are then coiled to form a z-filter media construction. Sucharrangements are described, for example, in U.S. Pat. Nos. 6,235,195 and6,179,890, each of which is incorporated herein by reference. In certainother arrangements, some non-coiled sections or strips of fluted(typically corrugated) media secured to facing media, are stacked on oneanother, to create a filter construction. An example of this isdescribed in FIG. 11 of U.S. Pat. No. 5,820,646, incorporated herein byreference.

Herein, strips of material comprising fluted sheet secured to corrugatedsheet, which is then assembled into stacks to form media packs, aresometimes referred to as “single facer strips”. The term “single facerstrip” and variants thereof is meant to refer to a fact that one face,i.e., a single face, fluted (typically corrugated) sheet, is faced bythe facing sheet, in the strip.

Typically, coiling of the fluted sheet/facing sheet (i.e., single facer)combination around itself, to create a coiled media pack, is conductedwith the facing sheet directed outwardly. Some techniques for coilingare described in U.S. provisional application 60/467,521, filed May 2,2003 and PCT Application US 04/07927, filed Mar. 17, 2004, now publishedas WO 04/082795 , each of which is incorporated herein by reference. Theresulting coiled arrangement generally his, as the outer surface of themedia pack, a portion of the facing sheet, as a result.

The term “corrugated” used herein to refer to structure in media, ismeant to refer to a flute structure resulting from passing the mediabetween two corrugation rollers, i.e., into a nip or bite between tworollers, each of which has surface features appropriate to cause acorrugation affect in the resulting media. The term “corrugation” is notmeant to refer to flutes that are formed by techniques not involvingpassage of media into a bite between corrugation rollers. However, theterm “corrugated” is meant to apply even if the media is furthermodified or deformed after corrugation, for example by the foldingtechniques described in PCT WO 04/007054, published Jan. 22, 2004,incorporated herein by reference.

Corrugated media is a specific form of fluted media. Fluted media ismedia which has individual flutes (for example formed by corrugating orfolding) extending thereacross.

Serviceable filter element or filter cartridge configurations utilizingz-filter media are sometimes referred to as “straight through flowconfigurations” or by variants thereof. In general, in this context whatis meant is that the serviceable filter elements generally have an inletflow end (or face) and an opposite exit flow end (or face), with flowentering and exiting the filter cartridge in generally the same straightthrough direction. The term “serviceable” in this context is meant torefer to a media containing filter cartridge that is periodicallyremoved and replaced from a corresponding fluid (e.g. air) cleaner. Insome instances, each of the inlet flow end (or face) and outlet flow end(or face) will be generally flat or planar, with the two parallel to oneanother. However, variations from this, for example non-planar faces,are possible.

A straight through flow configuration (especially for a coiled orstacked media pack) is, for example, in contrast to serviceable filtercartridges such as cylindrical pleated filter cartridges of the typeshown in U.S. Pat. No. 6,039,778, incorporated herein by reference, inwhich the flow generally makes a turn as its passes through theserviceable cartridge. That is, in a U.S. Pat. No. 6,039,778 filter, theflow enters the cylindrical filter cartridge through a cylindrical side,and then turns to exit through an end face (in forward-flow systems). Ina typical reverse-flow system, the flow enters the serviceablecylindrical cartridge through an end face and then turns to exit througha side of the cylindrical filter cartridge. An example of such areverse-flow system is shown in U.S. Pat. No. 5,613,992, incorporated byreference herein.

The term “z-filter media construction” and variants thereof as usedherein, without more, is meant to refer to any or all of a web ofcorrugated or otherwise fluted media secured to (facing) media withappropriate sealing to allow for definition of inlet and outlet flutes;or, a media pack constructed or formed from such media into a threedimensional network of inlet and outlet flutes; and/or, a filtercartridge or construction including such a media pack.

In FIG. 1, an example of media 1 useable in z-filter media is shown. Themedia 1 is formed from a fluted, in this instance corrugated, sheet 3and a facing sheet 4. A construction such as media 1 is deferred toherein as a single facer or single facer strip.

In general, the corrugated sheet 3, FIG. 1 is of a type generallycharacterized herein as having a regular, curved, wave pattern of flutesor corrugations 7. The term “wave pattern” in this context, is meant torefer to a flute or corrugated pattern of alternating troughs 7 b andridges 7 a. The term “regular” in this context is meant to refer to thefact that the pairs of troughs and ridges (7 b, 7 a) alternate withgenerally the same repeating corrugation (or flute) shape and size.(Also, typically in a regular configuration each trough 7 b issubstantially an inverse of each ridge 7 a.) The term “regular” is thusmeant to indicate that the corrugation (or flute) pattern comprisestroughs and ridges with each pair (comprising an adjacent trough andridge) repeating, without substantial modification in size and shape ofthe corrugations along at least 70% of the length of the flutes. Theterm “substantial” in this context, refers to a modification resultingfrom a change in the process or form used to create the corrugated orfluted sheet, as opposed to minor variations from the fact that themedia sheet 3 is flexible. With respect to the characterization of arepeating pattern, it is not meant that in any given filterconstruction, an equal number of ridges and troughs is necessarilypresent. The media 1 could be terminated, for example, between a paircomprising a ridge and a trough, or partially along a pair comprising aridge and a trough. (For example, in FIG. 1 the media 1 depicted infragmentary has eight complete ridges 7 a and seven complete troughs 7b.) Also, the opposite flute ends (ends of the troughs and ridges) mayvary from one another. Such variations in ends are disregarded in thesedefinitions, unless specifically stated. That is, variations in the endsof flutes are intended to be covered by the above definitions.

In the context of the characterization of a “curved” wave pattern ofcorrugations, the term “curved” is meant to refer to a corrugationpattern that is not the result of a folded or creased shape provided tothe media, but rather the apex 7 a of each ridge and the bottom 7 b ofeach trough is formed along a radiused curve. A typical radius for suchz-filter media would be at least 0.25 mm and typically would be not morethan 3 min.

An additional characteristic of the particular regular, curved, wavepattern depicted in FIG. 1, for the corrugated sheet 3, is that atapproximately a midpoint 30 between each trough and each adjacent ridge,along most of the length of the flutes 7, is located a transition regionwhere the curvature inverts. For example, viewing back side or face 3 a,FIG. 1, trough 7 b is a concave region, and ridge 7 a is a convexregion. Of course when viewed toward front side or face 3 b, trough 7 bof side 3 a forms a ridge; and, ridge 7 a of face 3 a, forms a trough.(In some instances, region 30 can be a straight segment, instead of apoint, with curvature inverting at ends of the segment 30.)

A characteristic of the particular regular, wave pattern fluted (in thisinstance corrugated) sheet 3 shown in FIG. 1, is that the individualcorrugations are generally straight. By “straight” in this context, itis meant that through at least 70%, typically at least 80% of the lengthbetween edges 8 and 9, the ridges 7 a and troughs 7 b do not changesubstantially in cross-section. The term “straight” in reference tocorrugation pattern shown in FIG. 1, in part distinguishes the patternfrom the tapered flutes of corrugated media described in FIG. 1 of WO97/40918 and PCT Publication WO 03/47722, published Jun. 12, 2003,incorporated herein by reference. The tapered flutes of FIG. 1 of WO97/40918, for example, would be a curved wave pattern, but not a“regular” pattern, or a pattern of straight flutes, as the terms areused herein.

Referring to the present FIG. 1 and as referenced above, the media 1 hasfirst and second opposite edges 8 and 9. When the media 1 is formed intoa media pack, in general edge 9 will form an inlet end for the mediapack and edge 8 an outlet end, although an opposite orientation ispossible.

Adjacent edge 8 is provided a sealant bead 10, sealing the corrugatedsheet 3 and the facing sheet 4 together. Bead 10 will sometimes bereferred to as a “single facer” bead, since it is a bead between thecorrugated sheet 3 and facing sheet 4, which forms the single facer ormedia strip 1. Sealant bead 10 seals closed individual flutes 11adjacent edge 8, to passage of air therefrom.

Adjacent edge 9, is provided seal bead 14. Seal bead 14 generally closesflutes 15 to passage of unfiltered fluid therein, adjacent edge 9. Bead14 would typically be applied as strips of the media 1 are secured toone another during stacking. Thus bead 14 will form a seal between aback side 17 of facing sheet 4, and side 18 of the next adjacentcorrugated sheet 3. When the media 1 is cut in strips and stacked,instead of coiled, bead 14 is referenced as a “stacking bead.” (Whenbead 14 is used in a coiled arrangement formed from media 1, notdepicted herein, it is referenced as a “winding bead.”)

Referring to FIG. 1, once the media 1 is incorporated into a media pack,for example by stacking, it can be operated as follows. First, air inthe direction of arrows 12, would enter open flutes 11 adjacent end 9.Due to the closure at end 8, by bead 10, the air would pass through themedia, for example as shown by arrows 13. It could then exit the mediapack, by passage through open ends 15 a of the flutes 15, adjacent end 8of the media pack. Of course operation could be conducted with air flowin the opposite direction.

For the particular arrangement shown herein in FIG. 1, the parallelcorrugations 7 a, 7 b are generally straight completely across themedia, from edge 8 to edge 9. Straight flutes or corrugations can bedeformed or folded at selected locations, especially at ends.Modifications at flute ends for closure are generally disregarded in theabove definitions of “regular,” “curved” and “wave pattern.”

Z-filter constructions which do not utilize straight, regular curvedwave pattern corrugation shapes are known. For example in Yamada et al.U.S. Pat. No. 5,562,825 corrugation patterns which utilize somewhatsemicircular (in cross section) inlet flutes adjacent narrow V-shaped(with curved sides) exit flutes are shown (see FIGS. 1 and 3, of U.S.Pat. No. 5,562,825). In Matsumoto, et al. U.S. Pat. No. 5,049,326circular (in cross-section) or tubular flutes defined by one sheethaving half tubes attached-to another sheet having half tubes, with flatregions between the resulting parallel, straight, flutes are shown, seeFIG. 2 of Matsumoto '326. In Ishii, et al. U.S. Pat. No. 4,925,561(FIG. 1) flutes folded to have a rectangular cross section are shown, inwhich the flutes taper along their lengths. In WO 97/40918 (FIG. 1),flutes or parallel corrugations which have a curved, wave patterns (fromadjacent curved convex and concave troughs) but which taper along theirlengths (and thus are not straight) are shown. Also, in WO 97/40918flutes which have curved wave patterns, but with different sized ridgesand troughs, are shown.

In general, the filter media is a relatively flexible material,typically a non-woven fibrous material (of cellulose fibers, syntheticfibers or both) often including a resin therein, sometimes treated withadditional materials. Thus, it can be conformed or configured into thevarious corrugated patterns, without unacceptable media damage. Also, itcan be readily coiled or otherwise configured for use, again withoutunacceptable media damage. Of course, it must be of a nature such thatit will maintain the required corrugated configuration, during use.

In the corrugation process, an inelastic deformation is caused to themedia. This prevents the media from returning to its original shape.However, once the tension is released the flute or corrugations willtend to spring back, recovering only a portion of the stretch andbending that has occurred. The facing media sheet is sometimes tacked tothe fluted media sheet, to inhibit this spring back in the corrugatedsheet. Such tacking is shown at 20.

Also, typically, the media contains a resin. During the corrugationprocess, the media can be heated to above the glass transition point ofthe resin. When the resin then cools, it will help to maintain thefluted shapes.

The media of the corrugated sheet 3 facing sheet 4 or both, can beprovided with a fine fiber material on one or both sides thereof, forexample in accord with U.S. Pat. No. 6,673,136, incorporated herein byreference. In some instances, when such fine fiber material is used, itmay be desirable to provide the fine fiber on the upstream side of thematerial and inside the flutes. When this occurs, air flow; duringfiltering, will typically be into the edge comprising stacking bead.

An issue with respect to z-filter constructions relates to closing ofthe individual flute ends. Although alternatives are possible, typicallya sealant or adhesive is provided, to accomplish the closure. As isapparent from the discussion above, in typical z-filter media,especially that which uses straight flutes as opposed to tapered flutesand sealant for flute seals, large sealant surface areas (and volume) atboth the upstream end and the downstream end are needed. High qualityseals at these locations are critical to proper operation of the mediastructure that results. The high sealant volume and area, creates issueswith respect to this.

Attention is now directed to FIG. 2, in which a z-filter mediaconstruction 40 utilizing a regular, curved, wave pattern corrugatedsheet 43, and a non-corrugated flat sheet 44, i.e., a single facer stripis schematically depicted. The distance D1, between points 50 and 51,defines the extension of flat media 44 in region 52 underneath a givencorrugated flute 53. The length D2 of the arcuate media for thecorrugated flute 53, over the same distance D1 is of course larger thanD1; due to the shape of the corrugated flute 53. For a typical regularshaped media used in fluted filter applications, the linear length D2 ofthe media 53 between points 50 and 51 will often be at least 1.2 timesD1. Typically, D2 would be within a range of 1.2-2.0 times D1,inclusive. One particularly convenient arrangement for air filters has aconfiguration in which D2 is about 1.25-1.35×DI. Such media has, forexample, been used commercially in Donaldson Powercore™ Z-filterarrangements. Another potentially convenient size would be one in whichD2 is about 1.4-1.6 times D1. Herein the ratio D2/D1 will sometimes becharacterized as the flute/flat ratio or media draw for the corrugatedmedia.

In the corrugated cardboard industry, various standard flutes have beendefined. For example the standard E flute, standard X flute, standard Bstandard C flute and standard A flute. FIG. 3, attached, in combinationwith Table A below provides definitions of these flutes.

Donaldson Company, Inc., (DCI) the assignee of the present disclosure,has used variations of the standard A and standard B flutes, in avariety of z-filter arrangements. These flutes are also defined in TableA arid FIG. 3.

TABLE A (Flute definitions for FIG. 3) DCI A Flute: Flute/flat = 1.52:1;The Radii (R) are as follows: R1000 = .0675 inch (1.715 mm); R1001 =.0581 inch (1.476 mm); R1002 = .0575 inch (1.461 mm); R1003 = .0681 inch(1.730 mm); DCI B Flute: Flute/flat = 1.32:1; The Radii (R) are asfollows: R1004 = .0600 inch (1.524 mm); R1005 = .0520 inch (1.321 mm);R1006 = .0500 inch (1.270 mm); R1007 = .0620 inch (1.575 mm); Std. EFlute: Flute/flat = 1.24:1; The Radii (R) are as follows: R1008 = .0200inch (.508 mm); R1009 = .0300 inch (.762 mm); R1010 = .0100 inch (.254mm); R1011 = .0400 inch (1.016 mm); Std. X Flute: Flute/flat = 1.29:1;The Radii (R) are as follows: R1012 = .0250 inch (.635 mm); R1013 =.0150 inch (.381 mm); Std. B Flute: Flute/flat = 1.29:1; The Radii (R)are as follows: R1014 = .0410 inch (1.041 mm); R1015 = .0310 inch (.7874mm); R1016 = .0310 inch (.7874 mm); Std. C Flute: Flute/flat = 1.46:1;The Radii (R) are as follows: R1017 = .0720 inch (1.829 mm); R1018 =.0620 inch (1.575 mm); Std. A Flute: Flute/flat = 1.53:1; The Radii (R)are as follows: R1019 = .0720 inch (1.829 mm); R1020 = .0620 inch (1.575mm).

Of course other, standard, flutes definitions from the corrugated boxindustry are known.

In general, standard flute configurations from the corrugated boxindustry can be used to define corrugation shapes or approximatecorrugation shapes for corrugated media. Comparisons above between theDCI A flute and DCI B flute, and the corrugation industry standard A andstandard B flutes, indicate some convenient variations.

II. Manufacture of Stacked Media Configurations Using Fluted Media,Generally

In FIG. 4, one example of a manufacturing process for making a mediastrip corresponding to strip 1, FIG. 1 is shown. In general, facingsheet 64 and the fluted (corrugated) sheet 66 having flutes 68 arebrought together to form a media web 69, with an adhesive bead locatedtherebetween at 70. The adhesive bead 70 will form a single facer bead14, FIG. 1.

The term “single facer bead” meaning a sealant bead positioned betweenlayers of a single facer; i.e., between the fluted sheet and facingsheet.

An optional darting process occurs at station 71 to form center dartedsection 72 located mid-web. The z-filter media or Z-media strip 74 canbe cut or slit at 75 along the bead 70 to create two pieces 76, 77 ofz-filter media 74, each of which has an edge with a strip of sealant(single facet bead) extending between the corrugating and facing sheet.Of course, if the optional darting process is used, the edge with astrip of sealant (single facer bead) would also have a set of flutesdarted at this location. The strips or pieces 76, 77 can then be cutacross, into single facer strips for stacking, as described below inconnection with FIG. 6.

Techniques for conducting a process as characterized with respect toFIG. 4 are described in PCT WO 04/007054, published Jan. 22, 2004incorporated herein by reference.

Still in reference to FIG. 4, before the z-filter media 74 is putthrough the darting station 71 the media 74 must be formed. In theschematic shown in FIG. 4, this is done by passing a flat sheet of media92 through a pair of corrugation rollers 94, 95. In the schematic shownin FIG. 4, the flat sheet of media 92 is unrolled from a roll 96, woundaround tension rollers 98, and then passed through a nip or bite 102between the corrugation rollers 94, 95. The corrugation rollers 94, 95have teeth 104 that will give the general desired shape of thecorrugations after the flat sheet 92 passes through the nip 102. Afterpassing through the nip 102, the flat sheet 92 becomes corrugated and isreferenced at 66 as the corrugated sheet. The corrugated (i.e., fluted)media sheet 66 is then secured to facing media sheet 64. (Thecorrugation process may involve heating the media, in some instances.)

Still in reference to FIG. 4, the process also shows the facing sheet 64being routed to the darting process station 71. The facing sheet 64 isdepicted as being stored on a roll 106 and then directed to thecorrugated sheet 66 to form the Z-media 74. The corrugated sheet 66 andthe facing sheet 64 are secured together by adhesive or by other means(for example by sonic welding).

Referring to FIG. 4, an adhesive line 70 is shown used to securecorrugated sheet 66 and facing sheet 64 together, as the sealant bead.Alternatively, the sealant bead for forming the facing bead could beapplied as shown as 70 a. If the sealant is applied at 70 a, it may bedesirable to put a gap in the corrugation roller 95, and possibly inboth corrugation rollers 94, 95, to accommodate the bead 70 a.

The type of corrugation provided to the corrugated media is a matter ofchoice, and will be dictated by the corrugation or corrugation teeth ofthe corrugation rollers 94, 95. One typical type of flute pattern willbe a regular, typically curved, wave pattern corrugation, of straightflutes, as defined herein above. A typical regular curved wave patternused, would be one in which the distance D2, as defined above, in acorrugated pattern is at least 1.2 times the distance D1 as definedabove. In one typical application, typically D2=1.25-1.35×D1; in anotherD2=1.4-1.6×D1. In some instances the techniques may be applied withcurved wave patterns that are not “regular,” including, for example,ones that do not use straight flutes.

As described, the process shown in FIG. 4 can be used to create thecenter darted section 72. FIG. 5 shows, in cross-section, one of theflutes 68 after darting and slitting.

A fold arrangement 118 can be seen to form a darted flute 120 with fourcreases 121 a, 121 b, 121 c, 121 d. The fold arrangement 118 includes aflat first layer or portion 122 that is secured to the facing sheet 64.A second layer or portion 124 is shown pressed against the first layeror portion 122. The second layer or portion 124 is preferably formedfrom folding opposite outer ends 126, 127 of the first layer or portion122.

Still referring to FIG. 5, two of the folds or creases 121 a, 121 b willgenerally be referred to herein as “upper, inwardly directed” folds orcreases. The term “upper” in this context is meant to indicate that thecreases lie on an upper portion of the entire fold 120, when the fold120 is viewed in the orientation of FIG. 5. The term “inwardly directed”is meant to refer to the fact that the fold line or crease line of eachcrease 121 a, 121 b, is directed toward the other.

In FIG. 5, creases 121 c, 121 d, will generally be referred to herein as“lower, outwardly directed” creases. The term “lower” in this contextrefers to the fact that the creases 121 c, 121 d are not located on thetop as are creases 121 a, 121 b, in the orientation of FIG. 5. The term“outwardly directed” is meant to indicate that the fold lines of thecreases 121 c, 121 d are directed away from one another.

The terms “upper” and “lower” as used in this context are meantspecifically to refer to the fold 120, when viewed from the orientationof FIG. 5. That is, they are not meant to be otherwise indicative ofdirection when the fold 120 is oriented in an actual product for use.

Based upon these characterizations arid review of FIG. 5, it can be seenthat a preferred regular fold arrangement 118 according to FIG. 5 inthis disclosure is one which includes at least two “upper, inwardlydirected, creases.” These inwardly directed creases are unique and helpprovide an overall arrangement in which the folding does not cause asignificant encroachment on adjacent flutes.

A third layer or portion 128 can also be seen pressed against the secondlayer or portion 124. The third layer or portion 128 is formed byfolding from opposite inner ends 130, 131 of the third layer 128.

Another way of viewing the fold arrangement 118 is in reference to thegeometry of alternating ridges and troughs of the corrugated sheet 66.The first layer or portion 122 is formed from an inverted ridge. Thesecond layer or portion 124 corresponds to a double peak (afterinverting the ridge) that is folded toward, and in preferredarrangements, folded against the inverted ridge.

Techniques for providing the optional dart described in connection withFIG. 5, in a preferred manner, are described in PCT WO 04/007054,incorporated herein by reference. Other techniques for media managementare described in PCT application US 04/07927, filed Mar. 17, 2004,incorporated herein by reference.

Techniques described herein are well adapted for use of media packs thatresult from arrangements that, instead of being formed by coiling, areformed from a plurality of strips of single facer.

Opposite flow ends or flow faces of the media pack can be provided witha variety of different definitions. In many arrangements, the ends aregenerally flat and perpendicular to one another.

The flute seals (single facer bead, winding bead or stacking bead) canbe formed from a variety of materials. In various ones of the cited andincorporated references, hot melt or polyurethane seals are described aspossible for various applications. These are useable for applicationsdescribed herein.

In FIG. 6, schematically there is shown a step of forming a stackedz-filter media pack from strips of z-filter media, each strip being afluted sheet secured to a facing sheet. Referring to FIG. 6, singlefacer strip 200 is being shown added to a stack 201 of strips 202analogous to strip 200. Strip 200 can be cut from either of strips 76,77, FIG. 4. At 205, FIG. 6, application of a stacking bead 206 is shown,between each layer corresponding to a strip 200, 262 at an opposite edgefrom the single facer bead or seal. (Stacking can also be done with eachlayer being added to the bottom of the stack, as opposed to the top.)

Referring to FIG. 6, each strip 200, 202 has front and rear edges 207,208 and opposite side edges 209 a, 209 b. Inlet and outlet flutes of thecorrugated sheet/facing sheet combination comprising each strip 200, 202generally extend between the front and rear edges 207, 208, and parallelto side edges 209 a, 209 b.

Still referring to FIG. 6, in the media pack 201 being formed, oppositeflow faces are indicated at 210, 211. The selection of which one offaces 210, 211 is the inlet end face and which is the outlet end face,during filtering, is a matter of choice. In some instances the stackingbead 206 is positioned adjacent the upstream or inlet face 211; inothers the opposite is true. The flow faces 210, 211, extend betweenopposite side faces 220, 221.

The stacked media pack 201 shown being formed in FIG. 6, is sometimesreferred to herein as a “blocked” stacked media pack. The term “blocked”in this context, is an indication that the arrangement is formed to arectangular block in which all faces are 90° relative to all adjoiningwall faces. Alternate configurations are possible, as discussed below inconnection with certain of the remaining figures. For example, in someinstances the stack can be created with each strip 200 being slightlyoffset from alignment with an adjacent strip, to create a parallelogramor slanted block shape, with the inlet face and outlet face parallel toone another, but not perpendicular to upper and bottom surfaces. Such ashape is discussed with respect to FIGS. 23 and 24.

In some instances, media pack 201 will be referenced as having aparallelogram shape in any cross-section, meaning that any two oppositeside faces extend generally parallel to one another.

It is noted that a blocked, stacked arrangement corresponding to FIG. 6is described in the prior art of U.S. Pat. No. 5,820,646, incorporatedherein by reference. It is also noted that stacked arrangements aredescribed in U.S. Pat. Nos. 5,772,883; 5,792,247; U.S. Provisional60/457,255 filed Mar. 25, 2003; and U.S. Ser. No. 10/731,564 filed Dec.8, 2003. All four of these latter references are incorporated herein byreference. It is noted that a stacked arrangement shown in U.S. Ser. No.10/731,504; is a slanted stacked arrangement.

III. Selected Media Packs; Filter Cartridges; and, General Cartridge Usein Air Cleaner Assemblies A. Media Pack Configuration Variations; FIGS.7 and 8.

The present disclosure, in part, relates to generation of, and use of,media pack configurations involving the utilization of single facerstrips of z-filter media (i.e. fluted, for example corrugated, sheetssecured to facing sheets) in stacked form, and in configurations that donot have a blocked, or slanted, rectangular, paralleogram configuration.That is, an inlet flow face (and outlet flow face) for the stacked mediapack generally does not have a rectangular perimeter definition. Eachflow face also typically has a non-circular perimeter definition.

The principles can be applied in a wide variety of configurations. Anexample will be understood by reference to FIGS. 7 and 8.

Referring to FIG. 7, a perspective view is depicted of a media stack300, for example made in accord with the principles described above.Media stack 300 includes: first and second opposite flow faces, 301,302; a first pair of opposite sides, 303, 304; and, a second pair ofopposite sides, 305, 306. Sides 303, 304, represent side ends of stripsof single facing material, each strip comprising a fluted sheet securedto a facing sheet. Single facer strips are schematically represented inFIG. 7, examples indicated at 309.

Faces 301, 302, are, generally, flow faces. In a typical z-filter mediastack such as stack 300, as discussed previously, fluted media sheetscontained within media stack 300, generally include flutes which extendin a direction between the flow faces 301, 302. At least a portion ofone of the flow faces 301, 302 will operate as a inlet flow face, in afilter cartridge utilizing some or all of media stack 300; and, at leasta portion of an opposite one of the flow faces 301, 302, will operate asan outlet flow face, in such a filter cartridge.

Herein when it is said that the flutes of the fluted sheet “extend in adirection” between the flow faces 301, 302, it is not meant that theflutes necessarily extend entirely one flow face 301 to the other flowface 302. Rather the general direction of extension is meant. The flutesmay be truncated at or adjacent one or more of the sides 301, 302, forexample by flute modification such as darts or other end pressing to themedia flutes.

At 310 phantom lines are shown, where a modification in the media stack300 will be made by a cut, in order to generate at least one media pack.For the particular example shown, the phantom line 310 indicates a cutline which will form two media packs, as discussed below, each of whichis incorporated into filter cartridge in accord with the presentdisclosure. Generation of two filter cartridges at once is a matter ofpositioning the cut line 310 to create two symmetrical halves when cut.

In FIG. 8, stack 300 is shown having been cut along line 310, FIG. 7, togenerate two media packs 320, 321 of similar or identical outerperimeter shapes, when viewed in plan view (toward one of the flow facesfor each of media packs 320, 321). The term “perimeter shaped” when usedin this context, to refer to the media packs 320, 321, is meant to referto general peripheral perimeter definition, not to specific surfacefeatures (such as flutes or corrugations) of the media.

It is noted that alternate cuts can be made to the one shown at 310,FIG. 7, to generate only one media pack for utilization in a singlecartridge, or to generate two or more of different shapes, for differentuses. Further, the cut 310 does not need to be straight, although suchwould typically be convenient for assembly. Typically the plane of cutline 310 is both straight and generally perpendicular to the flow faces301, 302.

From the process as previously described, it will be understood that oneof the side surfaces 305, 306 will be represented by a fluted (forexample; corrugated) sheet; and, an opposite one of surfaces 305, 306will comprise a facing (for example non-fluted or corrugated) sheet.From this it will be understood that the media packs 320, 321, will notbe precisely identical beyond general shape, since the sides 305, 306through which the line of cut 315 occurred, FIG. 7, have differentdetail, i.e. one is an exposed flute sheet and one is an exposed facingsheet, in the example process described.

It is noted that media packs according to the present disclosure, one ormore the media surfaces or sides 305, 306 can be covered, for examplewith a protective covering sheet, either before, or after, cutting.

In more general terms, in one aspect of application of the principlesdescribed herein, a media pack configuration is provided which comprisesa stack of single facers strips, each single facer strip comprising afluted sheet secured to facing sheet, the individual single facer stripsbeing secured together in a media pack. The media pack has first andsecond opposite flow faces with flutes of the fluted sheet(s) extendinggenerally in a direction between the flow faces. The flow faces aregenerally defined by a non-rectangular perimeter definition. An examplewould be perimeter definition comprising generally straight sides,typically four straight sides. Example would be trapezoidal, althoughalternatives are possible.

For a particular media pack 320, FIG. 8, the media pack first and secondopposite flow faces include flow face 331, which is viewable, andopposite face flow face 332; and, a first pair of opposite sides 339,340; and, second pair of opposite sides 335, 336.

The first pair of opposite sides 339, 340, comprise side edges of theflute strips 301, with the flute strips extending therebetween. Thesecond pair of opposite sides 335, 336, are formed by one comprising, ina typical media pack 320, an exposed a facing sheet, and the other anexposed fluted sheet.

For the particular example shown, a general perimeter shape is providedfor the media pack 320, in which, when flow a face (331, 332) is viewedin plan view one pair of sides 339, 340, comprises sides generallyplanar and non-parallel to one another; with one being longer (atintersection with the flow faces 331,332) than the other; and, a secondpair of sides edges (335, 336) is present which a extend generallyparallel to one another, and which form generally parallel intersectionswith faces 331, 332 that are not generally the same length. When lengthsare compared, linear distance between ends are compared, and flutes orcorrugations are disregarded.

The particular overall shape media pack 320, FIG. 8, can be described atrapezoidal block with flow faces 331, 332 each having a trapezoidalperimeter; although alternate shaped arrangements are possible utilizingthe principles described herein. For the particular block shape mediapack 320, FIG. 8, each of the sides 335, 336, 339, 340 extends generallyperpendicularly to planes of the flow faces 331, 332. This will beconvenient and typical, although alternatives are possible.

Herein when it is said that a side is planar, corrugations or flutes andmedia are disregarded. Further, when it is said that edge is “straight”flutes or corrugations of media are disregarded.

It is noted that stack of strips analogous to that shown in FIG. 8 canbe made from a stack of strips analogous to that shown in FIG. 8 can bemade a stack of strips, on the slanted side resulting from stripsprogressive shorter than adjacent strips. When such is the case, theside has a some what stepped configuration, as opposed to smoothstraight configuration. However, when embedded in a side panel of thetype discussed below the net result will be the appearance of a straightside.

B. Air Filter Cartridge Incorporating Media Pack 320, FIG. 8; See FIGS.9-13.

Reference numeral 400, FIG. 9 references a filter cartridgeincorporating a media pack 320 in accord with FIG. 8. In FIG. 9, thefilter cartridge is viewed in a direction oriented toward a media packface 332, which forms an outlet flow face 402 in the cartridge 400.

Media pack face 331 generally defines a inlet flow face 401 of thecartridge 400. When in use, air flow during filtering, proceeds throughair filter cartridge 400 from inlet flow face 401, to outlet flow face402. Still referring to FIG. 9, at 405 housing seal arrangement isprovided, in cartridge 400. The housing seal arrangement 405 provides,generally, for sealing to an air cleaner housing in use. The particularhousing seal arrangement 405 depicted comprises a peripheral sealarrangement 405 a, with a seal flange 405 b, that extends, peripherally,around the remainder of cartridge 400.

Referring again to FIG. 9, filter cartridge 400 can be characterized asincluding first pair of opposite sides 410, 411; and, second pair ofopposite sides 414, 415. The first pair of opposite sides 410, 411generally corresponds to sides 340, 339 of media pack 320, covered atleast in part by a side panel, 410 a, 411 a respectively. Sides 414, 415will typically be such that one comprises an exposed facing sheet andthe other an exposed fluted sheet, although alternatives as possible.However, as explained above, an optional covering can be positioned overone or both of sides 414, 415.

Still referring to FIG. 9, side 340 of media pack 320 comprises a sidepiece 410 a, typically comprising a molded-in-place side piece forsealing ends of strips 309, to form side 410 of cartridge 400. The mediapack side 339 is covered by side piece 411 a typically comprising amolded-in-place side piece forming side 411 of cartridge 400, oppositeside 410, and sealing ends of sides (i.e. as side edges) of the singlefacer strips 309.

Still referring to FIG. 9, media pack sides 335, 336 provide sides 414and 415 respectively of cartridge 400.

In FIG. 9 it is noted that housing seal arrangement 405 is recessed fromend 402 from end 401 slightly, as shown at 417.

For a typically arrangement, at least 50%, usually at 60% often at least70% of a length of the media pack 320 between flow faces 401, 402 ispositioned on a downstream side of housing seal arrangement 405 i.e.between housing seal arrangement 405 and outlet flow face 402.

In FIG. 10, cartridge 400 is shown in plan view, the view being directedtoward inlet face 401. Again, face 401 is the face into which air willbe filtered as directed, during operation of an air cleaner includingcartridge 400 therein.

Referring to FIG. 10, it is noted that the inlet flow face 401 has anon-rectangular perimeter (for the example shown a trapezoidal shapeperimeter with: opposite parallel (disregard filters or corrugations)side edges 401 r, 401 s, of different lengths; and, opposite side edges401x, 401y of different lengths, non-parallel to one another. When thelengths of edges are compared, in this manner, flutes or corrugationsare disregarded. For the particular example shown, edge 401 x extendsgenerally perpendicularly to edges 401 r, 401 s. Edge 401 y forms anangle X with edge 401 r of less than 90°, typically not greater than 80°usually not greater than 70°, often at least 40° and typically withinthe range of 45°-65°.

Referring again to FIG. 9, it is noted that in some examples a region450 of media pack 320 may not be covered by side pieces 410 a, 411 a.For example, panels 410 a, 411 a may be recessed from surface 401 adistance of at least 5 mm, typically 5 mm-10 mm.

Thus, in general terms, it is said that the side pieces 410 a, 411 acover at least a portion of the corresponding media pack sides 410, 411.Typically they cover at least the entire media pack side in extensionfrom the housing seal arrangement 405 to the outlet end 402. In someinstance they may be recessed from the flow face 401 a small amount. Inothers, they may cover the entire sides 410, 411.

FIG. 11 a schematic cross-sectional view taken along a plane of lines11-11, FIG. 9 is viewable.

Referring again to FIG. 9, the housing seal arrangement 405 generallycomprises a molded-in-place construction, meaning that after panels 410a, 411 a are positioned on media pack 320, sealing arrangement 405 ismolded to the resulting construction, peripherally therearound.

Attention is now directed to FIG. 12, an enlarged, fragmentary,cross-sectional view depicting a portion of the filter cartridge 400. InFIG. 12 the cross-sectional view is taken through the housing sealarrangement 405 at a location where housing seal arrangement 405 crossesside 410 (and side panel 410 a) of cartridge 400.

In general, the housing seal arrangement has a constant cross-sectionaround media pack 320 (i.e. around cartridge 400), except in cornerswhere some modification may result; the corners being generallyindicated in FIG. 10 at 430, 431, 432, and 433. Of course variationsfrom a consistent cross-section are possible, but a consistentcross-section is convenient for manufacture. Again the housing sealarrangement 405 will typically be molded-in-place, and techniques forthis are referenced generally below.

The housing seal arrangement 405 includes a compression portion 450forming flange 405 b, which has an outer annular surface 451 extendingbetween opposite ends 452, 453. End 453 is sized and positioned to beengaged by a pressure flange on a housing access cover, and end 452 issized and positioned to be directed toward a portion of a housing basesection, with a rib pressing into the seal member 450. This will bedescribed further in connection with FIG. 13 below.

Still referring to FIG. 12, the housing seal arrangement 405 includes abase section 460, by which the housing seal arrangement 405 is securedto the remaining portion of the cartridge 400. Base 460 includes aprojection 461 oriented to a recess, gap or space 462 between theprojection 461 and a portion of compression portion 450. Utilization ofthe gap 462 will be understood from discussion below, in connection withFIG. 13.

In FIG. 13, a schematic fragmentary large cross-sectional view depictingthe portion of cartridge 400 viewed in FIG. 12, positioned withinportions of an air cleaner housing 500, is provided. Referring to FIG.13, flange 405 b of housing seal arrangement 405 is shown compressedbetween a portion of housing base section 501 and a portion of housingaccess cover 502. In particular, seal pressure flange portion 503 onhousing access cover 502 is directed against surface 453; and, pressureflange portion 505 of housing base section 501 is pressed against thesurface 452. Bead projection 507 (typically a continuous bead inextension around cartridge 400) is provided on pressure flange 501, forprojection into compression portion 450 to facilitate sealing. It isalso noted that the housing base portion 501 includes a flange 509 thatprojects into recess or gap 462, at a location between projection 461and a portion of compression portion 450 of housing seal arrangement405.

Clamping forces directing access cover 502 toward housing base 501 canbe used to provide a pinch of housing seal flange portion 405 b, toensure non-filtered air does not bypass media pack 320 duringutilization of air cleaner assembly 500. Example features of the aircleaner assembly are understood by reference to FIGS. 14-16.

C. Air Cleaner Assembly, FIGS. 14-16.

In FIGS. 14-16 an air cleaner assembly or air cleaner, including acartridge 400 generally in accord with FIGS. 9-11 is shown. Referring toFIG. 14, the air cleaner 500 is depicted in exploded view. Housing base501 and access cover 502 are viewable, as well as cartridge 400.Cartridge 400 is positioned within an interior of housing base 501, andaccess cover 502 is put in place, typically being secured by the latcharrangements, or other securing arrangements, not shown. The accesscover 502 includes pressure flange 503 which will be pressed against ahousing seal arrangement 405, as discussed above in connection with FIG.13, compressing housing seal arrangement 405 against a pressure surfacewithin an interior of housing base 501, to ensure sealing.

It is noted that for the air cleaner 500 depicted in FIG. 14, latches orother securing arrangement for the access cover 502 are not depicted,for convenience. A variety of conventional over center latches orsimilar constructions can be used.

Still referring to FIG. 14, at 520 a frame piece is shown, which isinserted with an interior of housing base 501, for cartridge 400. Theframe piece 520 includes an outer perimeter 590 and cross pieces 591.The cross pieces at 591 can be positioned and used to support downstreamsurface 402 of cartridge 400, during installation. In some instances,media 592 can be provided in the frame piece 520, so that the frame 520can be used as a safety filter.

In FIG. 15, air cleaner 500 is shown assembled. Referring to FIG. 15,housing base 501 includes an outlet section 530 an inlet section 531.The example shown, the outlet section 530 and the inlet section 531 areintegral sections of a single molded piece. Outlet section 530 includesa side wall 533 which surrounds the installed cartridge 400 (FIG. 14)during use. Housing base 501 further includes rear wall 534, having anair flow outlet 535 therein. Outlet 535 can be shaped in a variety ofshapes and be positioned at a variety of locations. Typically, end wall534 will be configured to funnel air to outlet 535, in a convenientmanner. From outlet 535, filtered air from the air cleaner 500 isdirected to components for equipment assembly which the air cleaner 500installed for use. Typically the equipment will comprise a the vehicleor other equipment being internal combustion engine, and filtered airfrom outlet 535 is directed, in due course, into the engine for use ascombustion air.

Still referring to FIG. 15, housing inlet section 531 includes a sidewail 540 extending there around. The side 540 includes side panels 541,542, 543, 544. In side panel 542 an inlet aperture 550 is positioned asan inlet arrangement. In opposite side wall 544 analogous, but smaller,inlet 551 is provided. It is noted that inlet can be provided in one ormore of the side walls 541, 542, 543, 544 as an example. Preferredpositioning and the size of the inlet, will be a matter of choice, forthe equipment assembly involved, in which the air cleaner 550 is to beinstalled in use. Typically, duct work is used to direct unfiltered airto air cleaner 550 through one or more of the inlets 550, 551. If one ofthe inlets 550, 551 is not used, it can be closed to cover, or the aircleaner 500 can be assembled with only those inlet apertures intended tobe used, therein.

Typically, air flow inlets 551, 550, will be positioned in sidewalls ofthe section 531 that are not directed upwardly downwardly, in use,although alternatives are possible.

Referring to FIG. 15 at 557 a lower drain aperture is positioned, fordraining any water that is directed into the inlet arrangement 550, 551during use.

Still referring to FIG. 15, it is noted that inlet section 531 defines aaccess opening in base 501 at an end opposite from end wall 534. Theaccess opening which is covered by access cover 502 during use.

Still referring to FIG. 15, at 560 a transition step between sections530, 531 is provided, in housing base 501. An interior portion of stepor region 560 defines a pressure flange 505; bead 507 and flange 501,FIG. 13.

In FIG. 16, an inlet end perspective view of air cleaner 500 isdepicted. In FIG. 16, closed end panel 570 in access cover 502 isviewable. The panel 570 closes the access opening defined by inletsection 531.

Referring again to FIG. 14, between front panel 570 and pressure flange503, access cover 502 includes a sidewall portion 580. In exampledepicted in FIG. 14, sidewall portion 540 comprises a series of strutsof braces 581 positioned to direct a compression force from panel 570 topressure flange 503 in use. The struts or braces 581 are spaced todefine air flow openings 582 in sidewall portion 580 to facilitate airflow entering one or more of the inlet apertures 550, 551.

In general terms, an outer perimeter of panel 570 is larger than aperimeter of sidewall 580. Sidewall 580 and pressure flange 503 arereceived within upstream section 541 of housing 501, in use. This meansthat the sidewall 580 will extend across inlet flow apertures, such asflow apertures 550, 551. Air flow apertures 582 in sidewall 580, formedby struts 581, permit the air flow to pass generally through inlets 550,551 and also through sidewall 580, to reach upstream face 401 of thecartridge 400, during use.

Referring FIGS. 9-14 it is noted that the cartridge 400 does not includea specific handle thereon for grasping during installation. In someinstances, it may be desirable to utilize a handle, which can beattached to the cartridge 400 in a variety of ways.

The housing base 501 will be understood to have a cross-sectional shapewhich is trapezoidal when taken across the direction between the accessopening and end wall 534.

It is noted that during when the term “trapezoid” and variant thereof,is used to refer to portions to the cartridge 400 or air cleaner 500, ismeant that any curved corners should be disregarded, and only thegeneral shape of the sides defining the perimeter is referenced.

When installed, typically at least 60% (usually at least 70%) of alength cartridge 400 between flow faces 401, 402 is received withinoutlet section 530 of housing base 501.

D. Equipment Assembly Including Air Cleaner 500; FIGS. 17-21.

Reference numeral 600 of FIG. 17, depicts an example equipment system inwhich air cleaner 500 is installed, for use. In FIG. 17-21, theequipment system is depicted in fragmentary, schematic, views.

Referring first to FIG. 17, the equipment system 600, for example, cancomprise a vehicle having a wheel well 620. It can be seen that due tothe trapezoidal shape for outer perimeter 595, the air cleaner 500(which accommodates a trapezoidal shape of an interiorly receivedcartridge 400) air cleaner assembly 500 is conveniently sized to bepositioned into space 625, adjacent curved portion 621 of wheel well625. In FIG. 17, the assembly 600 is viewed in an orientation such thataccess cover 502 is viewable.

In FIG. 18 a view analogous, but opposite to, that of FIG. 17 isviewable. Thus, the portion of air cleaner 500 viewed includes outlet535.

In FIG. 19, side elevational view of equipment 600 including air cleaner500 positioned therein is provided. The view is toward inlet 550. InFIG. 19, arrow 650 indicates a general direction of air flow, duringfiltering.

In FIG. 20, a perspective view of assembly 600 is depicted, in which aircleaner 500 is viewed in exploded view. From this view, it is understoodhow installation of air filter cartridge 500, and cartridge 520, intoair cleaner 500, can be conducted. Thus, general servicing steps can beunderstood.

In FIG. 21, a perspective view is depicted, allowing for a viewing ofoutlet 535, (and inlet 551) and air cleaner 500.

E. Some Selected Materials; and Assembly.

A variety of materials can be utilized in air cleaner arrangementaccording to the present disclosure. Typically the air cleaner housingbase 501 and access cover 502 will comprise molded plastic parts. Themedia pack will comprise an appropriate media for the intendedapplication.

The side panels 410 a, 411 a, when molded-in-place in the cartridge 400,can be made from a variety of materials but typically will comprise afoamed polyurethane material molded to an as molded density of notgreater than 30 lbs./cubic ft (0.46 g/cc) typically not greater than 15lbs./cubic ft (0.24 g/cc) and sometimes no greater than 10 lbs./cubic ft(0.16 g/cc). The overall resulting material would typically have ahardness, Shore A, of no greater than 30, typically no greater than 25and often within the range 12-20. It is noted that within in someapplications, alternate densities and hardnesses can be used. However,the ranges stated will be typical, for many applications.

As described, side panels 410 a, 411 a, will typically bemolded-in-place, although in alternate constructions in panel 410 a, 411a, can comprise pre-molded parts, to which the media pack is sealed bypotting. Molded-in-place arrangements will be convenient, as they ensuresealing at edges of media strips.

Housing seal arrangement 405 will also typically comprise a polyurethanematerial; typically an analogous material to that described for thepanels 410 a, 411 a.

Typically the housing seal arrangement 405 would be molded-in-place,after the panels 410 a, 411 a, are positioned in the cartridge 400.

A variety of dimensions for filter cartridge can be utiliied, inarrangement according to the present disclosure. For an example system,a distance between inlet face 401 and out 402 is about 300 mm; thehousing; two parallel sides of the trapezoidal shaped inlet face areabout 367 mm and 104 mm respectively; and, the length of an edgeperpendicular to the parallel sides is about 350 mm.

The thickness between compression surfaces 452, 453, FIG. 12, is about16 mm; and surface 451 is spaced the distance of about 27.5 mm frompanel for 410 a.

Other dimensions for an example can be developed from scale.

IV. General Review

It is noted that a variety of features and techniques that canimplemented in filter cartridges and air cleaners are described herein.There is no specific requirement that all of the features described beincorporated in a selected assembly, to obtain advantage of featuresaccording to the present disclosure.

A new air filter cartridge is described. The cartridge includes a mediapack having first and second, opposite, flow faces; a first pair ofopposite sides; and, a second pair of opposites. The media packgenerally comprises a stack of strips of single facer media material,each strip including a fluted media sheet secured a facing media sheetand oriented with flutes of each fluted sheet extending in a directionbetween the first and second opposite, flow faces. It is note that thereis no specific requirement that the flutes extend continuously andcompletely between the opposite flow faces. In general, an appropriateinternal seal arrangement is provided within the media pack, to ensurethat air entering the first (inlet) flow face must pass through themedia before exiting from the second, outlet, flow face. This internalseal arrangement can comprise stacking and single facer seals,previously described.

A first pair of opposite sides comprises first and second sidesextending between the first and second flow faces and engaging the firstflow faces along first and second edges. The first edge has a differentlength then the second edge. Further, the second pair of opposite sidecomprises third and fourth sides extending between the first and secondopposite flow faces and also between the first and second sides. Thesecond pair of opposite side engages the first flow face along third andfourth edges.

An example air filter cartridges is described having first and secondmolded-in-place side panels with the first and second side of the mediapack embedded therein. Further, perimeter housing seal arrangement isprovided extending around the media pack. The housing seal arrangementtypically molded-in place, and also extends over the molded-in-placeside panels.

For an example provided, the first side extends in a plane non-parallelto the second side. Also an example provided that the third edges isshorter than the fourth edge, and extends generally such that the firstside is in a plane generally parallel with a fourth side.

In one example, the third side comprises an exposed fluted media sheetsurface, and the fourth side comprises an exposed facing media sheet andsurface. Typically the facing media sheet of each single facer stripcomprises a non-fluted sheet.

Typically, the first and second side each have panels, covering at least70%, typically at least 80% and usually at 90% of the associated side.An example characterized, of side panels cover the associate sidecompleted except for a recess region of 5 mm to 10 mm wide, adjacent aninlet flow face of the cartridge.

Typically, the media pack will have the entire portion of the first sidebetween housing seal arrangement and the outlet flow face embedded inthe first side panel, and an entire portion of the second side betweenthe housing seal arrangement and the outlet flow face embedded in thesecond side panel.

In alternate characterization, and air filter cartridge is providedwhich comprises a media pack having first and second opposite flowfaces; the media pack comprising a stack strips of single facer filtermaterial as described. The first flow face comprises a generally planarinlet flow face with a non-rectangular perimeter shape, typically atrapezoidal perimeter shape. A particular trapezoidal perimeter shapeshown is one in which there are four side edges comprising: a first pairof opposite edges which extend generally non-parallel to one another andwhich are of different lengths; and second pair of opposite edges whichextend between the first pair of opposite edges and which are ofnon-parallel to, and of different length from, each other. A first oneof the first pair of edges generally extends perpendicularly to thefirst pair of edges. An internal angle which forms a “slanted” side ofthe trapezoid, is typically at least 40° usually within the range of 40°to 70°.

Also according to the present disclosure an air cleaner assembly isprovided. The assembly includes a housing base. The base includes aperimeter wall and an end wall; the housing base defining an accessopening opposite the housing end wall. The housing base includes aninlet section and an outlet section, each surround by the perimeterwall. A portion of the perimeter wall surrounding the inlet sectionincludes at least one air flow inlet therein and the housing has an airflow outlet therein. The access cover is removably mounted on thehousing base, to close the access opening. The access cover includes anouter closed panel; an inner pressure flange; and, a side or perimeteredge in extension between the outer closed panel and the inner pressureflange. In example, the outer closed panel has a perimeter which largerthan the perimeter side. The access cover is positioned in the housingwith the outer closed panel cover closing the access opening in the baseand the pressure flange and side surrounded by the inlet section of thehousing.

A portion of the side or perimeter arrangement is overlapped by the airflow inlet in the housing base. At least a portion of the perimeterarrangement overlapped by the air flow inlet has air flow aperturestherethrough.

It is noted that more than one flow inlet aperture can be provided inthe housing base, if desired. In some instances more than one can beprovided, with all but one closed off in normal use, an option being tooclose to any one not oriented where inlet duct work is located.

The air cleaner assembly includes an air filter cartridge operationallypositioned within the air cleaner base. The cartridge comprises a mediapack having opposite inlet and outlet flow faces comprising a stack ofsingle facer media material as described. The perimeter housing sealarrangement extends around the media pack. For filter cartridge ispositioned within the housing base with the perimeter housing sealarrangement pressed between a pressure flange in the access cover and aportion of the housing base. Further, the inlet flow face of the mediapack is positioned in the housing inlet section at a location betweenthe air flow inlet and the housing outlet section.

In an example shown, the housing outlet section has a smaller outerperimeter than the housing inlet section; and, the housing perimeterwall defines a trapezoidal perimeter shape in each of the housing outletsection and the housing inlet section. Further, the air filter cartridgeis generally trapezoidal.

Typically at least 60% of the length in the media pack is containedwithin the outlet section of the housing base.

1. An air filter cartridge comprising: (a) a media pack having first and second, opposite, flow faces; a first pair of opposite sides; and a second pair of opposite sides; (i) the media pack comprising a stack of strips of single facer filter media material, each strip including a fluted media sheet secured to a facing media sheet and oriented with flutes of each fluted sheet extending in a direction between the first and second, opposite, flow faces; (ii) the first pair of opposite sides comprising first and second sides extending between the first flow face and the second flow face and engaging the first flow face along first and second edges; the first edge having a different length than the second edge; and, (iii) the second pair of opposite sides comprising third and fourth sides extending between the first and second opposite, flow faces and also between the first and second sides; the second pair of opposite sides engaging the first flow face along third and fourth edges.
 2. An air filter cartridge according to claim 1 including: (a) a perimeter housing seal arrangement extending around the media pack.
 3. An air filter cartridge according to claim 2 wherein: (a) The perimeter housing seal arrangement includes a pinch flange projecting outwardly from the media pack.
 4. An air filter cartridge according to claim 1 wherein: (a) the first side extends in a plane non-parallel to the second side.
 5. An air filter cartridge according to claim 4 wherein: (a) the third edge is shorter than the fourth edge.
 6. An air filter cartridge according to claim 5 wherein: (a) the third side extends in a plane generally parallel to the fourth side.
 7. An air filter cartridge according to claim 1 wherein: (a) the third side comprises an exposed fluted media sheet surface; and (b) the fourth side comprises an exposed facing media sheet surface.
 8. An air filter cartridge according to claim 7 wherein: (a) the facing media sheet, of each single facer strip, comprises a non-fluted sheet.
 9. An air filter cartridge according to claim 8 including: (a) a first side panel having at least 70% of a length of the first side between the first and second flow faces sealed thereto, and, (b) a second side panel having at least 70% of a length of the second side between the first and second flow faces sealed thereto.
 10. An air filter cartridge according to claim 9 wherein: (a) the first side panel is a molded-in-place side panel; and, (b) the second side panel is a molded-in-place side panel.
 11. An air filter cartridge according to claim 10 including: (a) a molded-in-place perimeter housing seal arrangement extending around the media pack and across the first and second side panels.
 12. An air filter cartridge according to claim 11 wherein: (a) the media pack includes an inlet flow face and an opposite outlet flow face; (b) an entire portion of the first side between the housing seal arrangement and the outlet flow face is embedded in the first side panel; and, (c) an entire portion of the second side between the housing seal arrangement and the outlet flow face is embedded in the second side panel.
 13. An air filter cartridge according to claim 12 wherein: (a) the first and second side panels are each recessed from the inlet flow face by a distance within the range of 5 mm to 10 mm.
 14. An air filter cartridge comprising: (a) a media pack having first and second, opposite, flow faces; (i) the media pack comprising a stack of strips of single facer filter media material, each strip including a fluted media sheet secured to a facing media sheet and oriented with flutes of each fluted sheet extending in a direction between the first and second, opposite, flow faces; (ii) the first flow face comprising a planar inlet flow face with a non-rectangular perimeter shape. 15.-16. (canceled)
 17. An air filter cartridge according to claim 14 wherein: (a) the first flow face has a trapezoidal perimeter shape.
 18. An air filter cartridge according to claim 17 wherein: (a) the media pack includes first and second, opposite, sides extending between the first and second, opposite, flow faces; each one of the first and second sides being a least partially embedded in a corresponding one of first and second, molded-in-place, side panels; and, (b) the air filter cartridge including a perimeter housing seal arrangement extending peripherally around the media pack and over the first and second, molded-in-place, side panels. 19.-20. (canceled)
 21. An air filter cartridge comprising: (a) a housing base; (i) the housing base including a perimeter wall and an end wall; the housing base defining an access opening opposite the housing end wall; (ii) the housing base having an inlet section and an outlet section, each surrounded by the perimeter wall; (iii) a portion of the perimeter wall surrounding the inlet section including at an air flow inlet arrangement therein; and, (iv) the housing having an air flow outlet therein; (b) an access cover removably mounted on the housing base; (i) the access cover including: an outer closed panel cover; an inner pressure flange; and a side arrangement extending between the outer closed panel and the inner pressure flange; the access cover being positioned on the housing base with; (A) the outer closed panel cover closing the access opening in the base; and, (B) the pressure flange and side arrangement surrounded by the inlet section of the housing; (ii) a portion of the side arrangement being overlapped by the air flow inlet arrangement; at least the portion of the side arrangement which is overlapped by the air flow inlet having an air flow aperture arrangement therethrough; and; (c) an air filter cartridge operably positioned within the air cleaner base; the air filter cartridge comprising; (i) a media pack having opposite inlet and outlet flow faces and comprising a stack of strips of single facer media material, each strip of single facer material including a fluted media sheet secured to a facing media sheet and oriented with flutes of each fluted sheet extending in a direction between the first and second, opposite flow faces; and, (ii) a perimeter housing seal arrangement extending around the media pack; (iii) the air filter cartridge being positioned within the housing base with: (1) the perimeter housing seal arrangement pressed between the pressure flange on the access cover and a portion of the housing base; and, (2) the inlet flow face of the media pack positioned in the housing inlet section at a location between the air flow inlet and the housing outlet section.
 22. An air cleaner assembly according to claim 21 wherein: (a) the housing outlet section has a smaller outer perimeter than the housing inlet section.
 23. An air cleaner assembly according to claim 22 wherein: (a) the housing perimeter wall defines a trapezoidal perimeter shape in each of the housing outlet section and the housing inlet section; and (b) the air filter cartridge is in accord with a selected claim
 1. 24. An air cleaner assembly according to claim 23 wherein: (a) at least 60% of a length of the media pack, between the inlet and outlet flow faces, is contained within the outlet section of the housing base.
 25. A method of forming an air filter cartridge, the method comprising steps of: (a) providing a media construction comprising single facer media material comprising fluted media secured to facing media and configured with flutes extending in a direction between first and second, opposite, flow faces; (b) cutting through the media construction to form a cut side; (c) embedding at least a portion of the cut side in a molded-in-place side panel; and, (d) positioning a housing seal arrangement around the cut media construction having the molded-in-place panel thereon.
 26. A method according to claim 25 wherein: (a) the step of cutting is conducted through the opposite flow faces. 27.-36. (canceled) 